well i would go for a nested if
if number modulo 3 and number modulo 5
write FizzBuzz
else if number modulo 3
write Fizz
else if number modulo 5
write Buzz
else
write number
so if we wanna reduce the amount of operations by two we could assign
mod3 = number modulo 3
mod5 = number modulo 5
if mod3 and mod5
.....
or did i missunderstand the problem ? or do you want examples of different languages ? ;D ....